Trait datafusion_physical_expr::PhysicalExprStats

pub trait PhysicalExprStats: Send + Sync {
    fn boundaries(&self, columns: &[ColumnStatistics]) -> Option<ExprBoundaries>;
}

A toolkit to work with physical expressions statistics. This API is currently experimental and might be subject to change.

Required Methods

fn boundaries(&self, columns: &[ColumnStatistics]) -> Option<ExprBoundaries>

Return an estimate about the boundaries of this expression’s result would have (in terms of minimum and maximum values it can take as well the number of unique values it can produce). The inputs are the column-level statistics from the current physical plan.

Implementors